mongo dart bug in isolate. Illegal instruction: 4

test_isolate.dart

#import("dart:isolate");
#import('../../mongo-dart/lib/mongo.dart');
/*
1) Clone the mongo dart project and reference the correct import location
2) dart test_isolate.dart

13:37:00-adam@Adams-MacBook-Air:~/dart/test
$ dart test_isolate.dart 
enter find
Illegal instruction: 4

*/


// class used for simple async class
class AnotherAsyncClass {
  Future open() {
    Completer c = new Completer();
    c.complete("blamamal");
    return c.future;
  }
}


Future<String> find(msg) {
  print("enter find");
  
  Completer completer = new Completer();
  // Creates the following error: Illegal instruction: 4 
  Db db = new Db('some-db-test');

  completer.complete("some dummy data, comment out to test db.open() or a.open()");
// DbCollection collection;
  
//  AnotherAsyncClass a = new AnotherAsyncClass();
//  a.open().then((_) {
//    
//  });
//  print("before db.open in find");
//  db.open().chain((_){
//    print("open db in find");
//    collection = db.collection("somecollection");    
//    return collection.findOne({"somefield":msg});
//  }).chain((v){
//    completer.complete(v);
//  });
   
  print("ret find");
  return completer.future;
}

new_isolate() {
  port.receive((msg, reply) { 
    Future f = find(msg); 
    f.handleException((e)=>print("e = ${e}"));
    f.then((r)=>reply.send(r));
  });
}

main() {
  spawnFunction(new_isolate).call("findme").then((s)=>print("s=$s"));
}